Rdzanek Wojciech P, Rdzanek Witold J, Engel Zbigniew, Szemela Krzysztof
Department of Acoustics, University of Rzeszów, Rzeszów, Poland.
Int J Occup Saf Ergon. 2007;13(2):147-57. doi: 10.1080/10803548.2007.11076718.
The modal low frequency noise generated by a vibrating elastically supported circular plate embedded into a flat infinite baffle has been examined. The main aim of this study is the analysis of the radiation efficiency. Low frequency approximated formulas have been presented. They are valid for all the limiting boundary conditions of the plate with its edge clamped, guided, simply supported or free as well as for all the intermediate axisymmetric boundary configurations. The formulas are expressed in the elementary form, useful for numerical computations. They are a generalization of some earlier published results. First, they are valid for axisymmetric and asymmetric modes since both kinds of modes play an important role in the low frequency range. Second, a single formula for the radiation efficiency, valid for all the axisymmetric boundary configurations, has been proposed. A numerical example for the sound power radiation has been given for some hatchway covers mounted on a ship deck.
对嵌入平坦无限大障板中的弹性支撑圆形振动板产生的模态低频噪声进行了研究。本研究的主要目的是分析辐射效率。给出了低频近似公式。这些公式适用于板的所有极限边界条件，其边缘为夹紧、导向、简支或自由，以及所有中间轴对称边界配置。这些公式以基本形式表示，便于数值计算。它们是对一些早期发表结果的推广。首先，它们对轴对称和非对称模式均有效，因为这两种模式在低频范围内都起着重要作用。其次，提出了一个适用于所有轴对称边界配置的辐射效率单一公式。针对安装在船甲板上的一些舱口盖给出了声功率辐射的数值示例。
